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J & F Oil Tools, Inc. Patents |
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Assignee: J & F Oil Tools, Inc.
Address: Beaumount, TX
No. of patents: 1
Patents:
| Patent Number |
Title Of Patent |
Date Issued |
| 4657092 |
Circulation reversing tool |
April 14, 1987 |
| A transformable circulation tool for reversing the path of drilling fluid at the drill bit without removing the drill string from the borehole annulus is provided by a substantially hollow body having a chamber with external ports disposed between a section of the body having a through |
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